The books first came into publication in 2006 by Black Library, and are written by various authors, and was started as a campaign setting for the Warhammer 40,000 miniature wargame until it became a full-fledged line of novels that continue to tell the story set in different time periods before the 41st century, before and after the fictional civil war. It is a devastating galaxy-spanning civil war that engulfs the nascent galactic empire of the Imperium of Man early in the 31st millennium of the universe timeline the war is a major cause of the science fantasy universe’s dystopian environment.

The Horus Heresy is a cornerstone even in a fictional universe that provides the background story for the Warhammer 40,000.

The Warhammer 40,000 is a tabletop miniature war game that is produced by Games Workshop and is set in a dystopian sci-fi universe. The Horus Heresy is a dark, far future, sci-fi war saga that takes place during the Horus Heresy, a cornerstone event of the dystopian science fantasy Warhammer 40,000 universe.

Horus heresy reading order